Briquetting iron oxide



UNITED STATES W'ALTER MATEESIUS, OE CHARLOTTENBURG, GERMANY.

BRIQUETTING IRON OXIDE.

pecification of Letters Patent.

Patented Jan. 10, 1922.

No Drawing. Application filed March 18, 1916, Serial No. 85,172. Renewed April 12, 1921. Serial T 0 all whom "it may concern Be it known that I, XXVEQLITER hila'rnnsios, professor, Ueheimer liegierungsrat, residing at Charlottenburg, Germany, a subject of the Emperor of Germany, have invented certain new and useful Improvements in Briquetting Iron Oxide, oi which the following -is a specification.

This invention relates to improvements in the process of manufacturing briquets, such as is claimed in my Patent No. 1,1044%, of January 21, 191 1, and especially in the method of producing the particular binding medium therein disclosed, namely, calciunr i'erroaluminosilicate. The latter is essentially a highly calcareous binder containing iron oxide, and therein the iron oxide does not function as a passive cementing substance, but as an active cementing agent, whereby the iron hydroxid formed replaces alumina in part.

The process or" briquetting formerly in vogue often necessitated the use of a considerable quantity or" the binding medium and thus reduced the percentage of iron in the finished briquet. Furthermore the binding materials, such as lime and quartz or cement usually had to be secured independently of the iron ores to be briqueted or smelted,

' whereby the expense of the briquetting operation was often rendered excessive. The herein described method reduces the cost and enhances the convenience of the briquetting process by utilizing certain iron ores themselves as the source of the binding nuterials.

It has been discovered that the fines or friable portion of certain kinds 01" iron ores having a calcareous gangue, such as limestone, together with silica and alumina sometimes carry approximately the desired proportions of the compounds required to produce a highly basic binder rich in iron, such as is desired. \Vhen such ores are burned lime is produced and unless there is present too much iron oxid, the mixture will then be suitable for producing calciumferroaluminosilicate. Usually however, the composition of the ore is such that the ore will not, without further treatment, itself suifice to furnish the desired binder.

In the case of such ores as contain too much iron oxid in proportion to the calcareous gangues, it is proposed to take out a part of the said iron oxid by means of magnetic or air separation, naturally preceded in the former case, by a magnetizing roast. The

the excess of iron oXid has been removed is then sintered together and may serve as the binder for the separated iron oxide as well as for any other finely-divided iron ore to be briqueted.

In most cases it is desirable to separate, as far as is possible, the component parts of the crude ore, by magnetic or mechanical methods, that is, to separate the portion rich in iron from those portions high in calcareous material or in alumina and silica, and then to recombine them in the desired proportions to form the above mentioned calciumferroaluminosilicate binder.

The preliminary treatment of the iron ore by calcination may comprise an oxidizing as well as reducing roast, and be followed by a quenching of the calcines. The ore is thereby more completely disintegrated than by the usual mechanical methods, the iron ore is magnetized for the magnetic separating step, the calcareous component is decomposed into a fine powder, and the silicious parts of the ore remain unaltered and suitable for the subsequentvseparating or dressing operation.

1. The method of obtaining a binder for lriquetting purposes from iron ore containing a calcareous and siliceous gangue comarising mechanically separating the iron oxide from the gangue and the gangue into a calcareous and a non-calcareous portion and selecting such proportions of each of these products as to form a highly basic binder and sintering them together.

2-. The method o1"- obtaining a binder for briquetting purooses from material containing iron oxid and a calcareous and siliceous gangue consisting in roasting the material, mechanically separating the roastedmaterial into iron oxid and into a calcareous and a non-calcareous relatively iron free procluct, selecting such proportions oi the calcareous and non-calcareous products as to form a basic binder with the iron oxioe product and then combining these products.

3. The method of obtaining a binder for briquetting purposes from material contain ing iron oxide and a calcareous and siliceous gangue consisting in subjecting the material to a magnetizing roast and then to magnetic separation, whereby a substantially gangueportion of the ore and gangue from which free iron'oxide and calcareous and non-cal careous products relatively free from iron are obtained, selecting such proportions of these products as to form a basic binder, and sintering them to ether. 7

4. The method of dbta-ining a binder for briquets from finely divided ore containing iron oxide and a calcareous and siliceous gangue, comprising mechanically separating the ore and gangue into portions high in iron, high in silica and high in calcareous matter and selecting such quantities of the last two portions as to form a basic binder with the separated iron oxide and sintering the aggregate.

The method of obtaining a binder for briquets from finely-divided iron oxide ore having a calcareous and siliceous gangue comprising mechanically separating the bulk of the iron oxide from the gangue, and the latter roughly into its basic and acid components, selecting such proportions of these components as to form a basic binder with the separated iron oxide and then associating these ingredients to form the binder.

6. The method of obtaining a binder for making briquets from iron ore having a calcareous and alumino-siliceous gangue consisting in calcining the raw material, me chanically separating the calcined material into products rich in iron, high in lime and high in alumina and silica, and selecting and combining such quantities of each'of these products as to form a highly basic binder, calcium ferro aluminosilicate, :tor the purpose of agglomerating ferruginous material.

7. The method of obtaining a binder for making briquets from iron ore having a calcareous and siliceous gangue consisting in subjecting the material to a magnetizing roast and magnetically separating the excess of iron oxide over the quantity required to form a highly basic calcium-ferroaluminosilicate binder and sintering together the remaining material from which the excess of iron oxide has been removed to form the binder.

S. The method of forming a binder for briquets from finely divided iron oxide ore having a calcareous and alumino-silicemis gangue comprising roasting and then mechanically separating the above material into ferruginous, calcareous and alumino siliceous products, and combining such quantities of each of these products as to form a highly basic binder, caleiumferroalumino silicate, for the purpose of agglomerating ferruginous material. 7

In testimony whereof I ailix my signature in presence of two witnesses.

lVALTHER B'IATHESIUS, lnor. li itnesses HENRY Hasrnu,

ARTHUR SOI-IROEDER. 

